In blue-green algae,photosynthesis is ........

What type of microorganism is $Oscillatoria$?

Most parasitic bacteria are ........

Which of the following microorganisms possess the property of both photosynthesis and nitrogen fixation?

$S$ - Statement: Bacteria are divided into two groups based on the staining procedure developed by Gram.
$R$ - Reason: Bacteria that take up the Gram stain are called Gram-negative.

In some cyanobacteria,pigment-containing membranous extensions are called ..........